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Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details) shares in Millions, $ in Millions		12 Months Ended
	Sep. 19, 2018 € / shares	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($) shares	Mar. 31, 2021 USD ($) shares	Apr. 12, 2021 € / shares	Mar. 31, 2020 USD ($)	Dec. 31, 2014 € / shares
Noncontrolling Interest [Line Items]
Put right (in euro per share) | € / shares	€ 23.50				€ 22.99
Annual increase in interest (percent)							5.00%
Put Right increase (euros per share) | € / shares	€ 0.51
Payments to purchase shares of McKesson Europe		$ 0	$ 1,031	$ 49
Exercise of put right by noncontrolling shareholders of McKesson Europe AG			8	3
Reclassification of McKesson Europe AG redeemable noncontrolling interests			(287)
Noncontrolling interests		367	480
Net income attributable to noncontrolling interests		162	173	199
Redeemable Noncontrolling Interests
Noncontrolling Interest [Line Items]
Net income (loss) attributable to redeemable noncontrolling interest		0	8	43
Exercise of put right			983	49
Reclassification of McKesson Europe AG redeemable noncontrolling interests			287
Additional Paid-in Capital
Noncontrolling Interest [Line Items]
Exercise of put right by noncontrolling shareholders of McKesson Europe AG			178	3
Noncontrolling Interests
Noncontrolling Interest [Line Items]
Exercise of put right			0	0
Reclassification of McKesson Europe AG redeemable noncontrolling interests			(287)
Noncontrolling interests		367	480	196		$ 217
Net income attributable to noncontrolling interests		162	165	156
McKesson Europe
Noncontrolling Interest [Line Items]
Net income (loss) attributable to redeemable noncontrolling interest			8	43
Put right (in euro per share) | € / shares							€ 22.99
Payments to purchase shares of McKesson Europe			$ 1,000	$ 49
Shares purchased (shares) | shares			34.5	1.8
Percentage of outstanding common shares			95.00%
Vantage and ClarusOne Sourcing Services LLC
Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interests		$ 162	$ 165	$ 156
McKesson Europe
Noncontrolling Interest [Line Items]
Annual recurring compensation (in euro per share) | € / shares					€ 0.83		€ 0.83

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